Method for reporting capability information and dual mode user equipment adapted thereto

ABSTRACT

A system and a method that reports capability information regarding a dual mode User Equipment (UE) are provided. The UE supports Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The UE capability transmitting method includes receiving a message requesting UE capability information from an evolved Node B (eNB), generating first capability information and second capability information according to the UE capability information requesting message, and transmitting UE capability information including the first and second capability information to the eNB. The first capability information comprises FDD capability information applicable to an FDD mode or TDD capability information applicable to a TDD mode. The second capability information comprises capability information applicable to both the FDD mode and the TDD mode. The system and method can allow a dual mode UE to efficiently report its capability information.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of prior application Ser.No. 13/571,735, filed on Aug. 10, 2012, which claimed the benefit under35 U.S.C. §119(e) of U.S. Provisional Application No. 61/521,910, filedon Aug. 10, 2011, U.S. Provisional Application No. 61/524,000, filed onAug. 16, 2011, U.S. Provisional Application No. 61/531,185, filed onSep. 6, 2011, U.S. Provisional Application No. 61/552,114, filed on Oct.27, 2011, U.S. Provisional Application No. 61/591,385, filed on Jan. 27,2012, and under 35 U.S.C. §119(a) of a Korean patent application filedon Aug. 6, 2012 in the Korean Intellectual Property Office and assignedSerial No. 10-2012-0085793, the entire disclosure of each of which ishereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to dual mode communication. Moreparticularly, the present invention relates to an apparatus and methodthat allows a dual mode User Equipment (UE) to efficiently report itscapability information.

2. Description of the Related Art

Mobile communication systems have been developed to provide users withcommunication services while they are moving. With the rapid developmentof communication technology, mobile communication systems can providehigh speed data communication services as well as voice communication.

A Long Term Evolution (LTE) system, which is a next generation mobilecommunication system, is standardized in the 3rd Generation PartnershipProject (3GPP). The LTE system implements high speed packet basedcommunication at a data transfer rate of up to 100 Mbps, which is higherthan the current data transfer rate.

In recent years, the LTE communication system has been combined withother technologies to enhance the transfer rate, and this is called LongTerm Evolution-Advanced (LTE-A) system. A technology introduced by theLTE system is carrier aggregation. Carrier aggregation enables one UE touse a number of forward carriers and a number of reverse carriers,compared with the technology of the related are in which a UE performsdata transmission/reception only using one forward carrier and onereverse carrier. To support carrier aggregation, a UE can be equippedwith additional functions and parts, which are mandatory and optional,respectively.

When an evolved Node B (eNB) establishes a wireless channel with the UE,it needs to precisely detect the capability of the UE. To this end, aprocedure has been defined in which the UE reports its capabilities to anetwork. However, the conventional capability information was designedfor a single mode UE. Therefore, a system and method is required thatallows a dual mode UE to efficiently report its capability information.

The above information is presented as background information only toassist with an understanding of the present disclosure. No determinationhas been made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the present invention.

SUMMARY OF THE INVENTION

Aspects of the present invention are to address at least theabove-mentioned problems and/or disadvantages and to provide at leastthe advantages described below. Accordingly, an aspect of the presentinvention is to provide an apparatus and method that allows a dual modeUser Equipment (UE) to efficiently report its capability information.

In accordance with an aspect of the invention, a method fortransmitting, by a UE that supports Frequency Division Duplex (FDD) andTime Division Duplex (TDD), UE capability information to an evolved NodeB (eNB), is provided. The method includes receiving a message requestingUE capability information from the eNB, generating first capabilityinformation and second capability information according to the UEcapability information requesting message, and transmitting UEcapability information including the first and second capabilityinformation to the eNB. The first capability information comprises FDDcapability information applicable to an FDD mode or TDD capabilityinformation applicable to a TDD mode. The second capability informationcomprises capability information applicable to both the FDD mode and theTDD mode.

In accordance with another aspect of the invention, a UE that supportsFDD and TDD is provided. The UE includes a transceiver for receiving amessage requesting UE capability information from an eNB, and acontroller for generating first capability information and secondcapability information according to the UE capability informationrequesting message. The transceiver transmits UE capability informationincluding the first and second capability information to the eNB. Thefirst capability information comprises FDD capability informationapplicable to an FDD mode or TDD capability information applicable to aTDD mode. The second capability information comprises capabilityinformation applicable to both the FDD mode and the TDD mode.

In accordance with another aspect of the present invention, a method forreceiving, by an eNB, capability information regarding a UE is provided.The method includes transmitting a message requesting UE capabilityinformation to the UE, and receiving UE capability information includingfirst capability information and second capability information, inresponse to the request message, from the UE. The first capabilityinformation comprises FDD capability information applicable to an FDDmode or TDD capability information applicable to a TDD mode. The secondcapability information comprises capability information applicable toboth the FDD mode and the TDD mode.

In accordance with another aspect of the present invention, an eNB isprovided. The eNB includes a transceiver for transmitting a messagerequesting UE capability information to a UE, and for receiving UEcapability information including first capability information and secondcapability information, in response to the request message, from the UE.The first capability information comprises FDD capability informationapplicable to an FDD mode or DD capability information applicable to aTDD mode. The second capability information comprises capabilityinformation applicable to both the FDD mode and the TDD mode.

Other aspects, advantages, and salient features of the invention willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainexemplary embodiments of the present invention will be more apparentfrom the following description taken in conjunction with theaccompanying drawings, in which:

FIG. 1 illustrates a configuration of a Long Term Evolution (LTE) systemaccording to an exemplary embodiment of the present invention;

FIG. 2 illustrates a wireless protocol stack of an LTE system accordingto an exemplary embodiment of the present invention;

FIG. 3 illustrates a flowchart that describes a method for establishinga wireless connection between a User Equipment (UE) and an evolved NodeB (eNB) according to an exemplary embodiment of the present invention;

FIG. 4 illustrates a flowchart that describes a capability informationreporting method according to an exemplary embodiment of the presentinvention;

FIG. 5 illustrates a flowchart that describes a method for transmittingcapability information by a UE, according to a first exemplaryembodiment of the present invention;

FIG. 6 illustrates a flowchart that describes a method for reportingcapability information by a UE, according to a second exemplaryembodiment of the present invention;

FIG. 7 illustrates a flowchart that describes a method for reportingcapability information via a UE, according to a third exemplaryembodiment of the present invention;

FIG. 8 illustrates a schematic block diagram of a UE according to anexemplary embodiment of the present invention; and

FIG. 9 illustrates a schematic block diagram of an eNB according to anexemplary embodiment of the present invention.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features, andstructures.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of exemplaryembodiments of the invention as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the embodiments described hereincan be made without departing from the scope and spirit of theinvention. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of theinvention. Accordingly, it should be apparent to those skilled in theart that the following description of exemplary embodiments of thepresent invention is provided for illustration purpose only and not forthe purpose of limiting the invention as defined by the appended claimsand their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

Detailed descriptions of well-known functions and structuresincorporated herein may be omitted to avoid obscuring the subject matterof the invention. Exemplary embodiments of the invention are describedbelow with reference to the accompanying drawings.

FIG. 1 illustrates a configuration of a Long Term Evolution (LTE) systemaccording to an exemplary embodiment of the present invention.

Referring to FIG. 1, the LTE system configures the wireless accessnetwork, including evolved Node Bs (eNBs) 105, 110, 115 and 120, aMobility Management Entity (MME) 125, and a Serving-Gateway (S-GW) 130.A User Equipment (UE) 135 can access an external network via the eNBs105, 110, 115 and 120 and the S-GW 130.

The eNBs 105, 110, 115 and 120 correspond to conventional Node Bs of theUniversal Mobile Telecommunications System (UMTS) system and each eNBcontrols a number of cells. However, eNBs 105, 110, 115 or 120, any ofwhich can provide service to the UE 135 via a wireless channel, performmore complicated functions than a conventional Node B. Since LTE systemsprovide real time services, such as Voice over Internet Protocol (VoIP),and all user traffic via a shared channel, they require devices that cancollect state information, such as a UE buffer state, an availabletransmission power state, a channel state, etc., in order to schedule,for example, eNBs 105, 110, 115 and 120. In order to implement atransfer rate of 100 Mbps, an LTE system employs Orthogonal FrequencyDivision Multiplexing (OFDM) at a bandwidth of 20 MHz, as a wirelessaccess technology. LTE systems also employ Adaptive Modulation & Coding(AMC) to determine a modulation scheme and a channel coding rate,meeting with the channel state of the UE. The S-GW 130 provides a databearer and creates or removes data bearers according to the control ofthe MME 125. The MME 125 manages the mobility of a UE, controls avariety of functions, and connects to a number of eNBs.

FIG. 2 illustrates a wireless protocol stack of an LTE system accordingto an exemplary embodiment of the present invention.

Referring to FIG. 2, a UE and an eNB respectively have Packet DataConvergence Protocol (PDCP) layers 205 and 240, Radio Link Control (RLC)layers 210 and 235, and Medium Access Control (MAC) layers 215 and 230.PDCP layers 205 and 240 compress/decompress an IP header. RLC layers 210and 235 reconfigure a PDCP Packet Data Unit (PDU) in a proper size andperform an ARQ process. MAC layers 215 and 230 connect to a number ofRLC layer devices configured in one UE. MAC layers 215 and 230 multiplexRLC PDUs to a MAC PDU, and de-multiplex RLC PDUs from a MAC PDU.PHYsical (PHY) layers 220 and 225 channel-code and modulate data fromthe upper layers, create OFDM symbols, and transmit them via a wirelesschannel. In addition, PHY layers 220 and 225 demodulate andchannel-decode OFDM symbols received via a wireless channel, andtransfer them to the upper layers.

FIG. 3 illustrates a flowchart that describes a method for establishinga wireless connection between a UE and an eNB according to an exemplaryembodiment of the present invention.

Referring to FIG. 3, a UE 305 and an eNB 310 can set a variety offunctions therebetween according to the capability of the UE 305 and thestates of the eNB 310.

For example, the UE 305 and the eNB 310 can set a DiscontinuousReception (DRX) feature in order to allow the UE 305 to preventexcessive battery power from being consumed at step 315. The UE 305 andthe eNB 310 can set a short DRX feature to maximally save the batterypower in the UE 305 according to a traffic state at step 320. The UE 305and the eNB 310 can set a Semi-Persistent Scheduling (SPS) feature toefficiently support a voice service at step 325. The UE 305 and the eNB310 can set a 64 Quadrature Amplitude Modulation (64 QAM) feature toincrease the transfer rate of the UE 305 close to the eNB 310 at step330. The UE 305 and the eNB 310 can set a UE specific reference signalfeature at step 335. Since none of steps 315 to 335 are mandatory, anyor all of them may or may not be performed.

In order to set a specific feature to the UE 305 according to states,the eNB 310 needs to determine whether the UE 305 has implemented acorresponding feature and has been subjected to an Inter-OperabilityTest (IOT). More particularly, the eNB 310 must perform thedetermination if the UE 305 is a dual mode type of UE that supports bothFrequency Division Duplex (FDD) and Time Division Duplex (TDD). A dualmode UE may support a feature in only one mode, or may perform IOT for afeature in only one mode. In that case, the UE 305 needs to report, tothe eNB 310, a mode where a corresponding function for a feature can beexecuted or a mode where a feature has been subjected to an IOT.Exemplary embodiments of the present invention provide a system andmethod that can efficiently report information regarding the respectivemodes. A dual mode UE refers to a type of UE that can support two duplexmodes, i.e., FDD and TDD. A duplex mode corresponds to a frequency band,one-to-one. Therefore, a dual mode UE can support at least one FDD bandand at least one TDD band.

FIG. 4 illustrates a flowchart that describes a capability informationreporting method according to an exemplary embodiment of the presentinvention.

Referring to FIG. 4, an event occurs in a dual mode UE 405 such that thedual mode UE 405 needs to newly report its capabilities at step 420. Anexample of the event is a case where the UE 405 is turned on or thecurrent UE capabilities differ from the previously reported UEcapabilities. More particularly, if the UE 405 reports its capabilitieswhile connecting to an FDD network and then moves the connection to aTDD network, or if the UE 405 reports its capabilities while connectingto a TDD network and then moves the connection to an FDD network, itneeds to newly report its capabilities.

The UE 405 exchanges an RRC CONNECTION SETUP REQUEST message and an RRCCONNECTION SETUP message with an eNB 410 at step 425. The UE 405 and theeNB 410 establish an RRC connection therebetween to transmit controlmessages to each other. The RRC CONNECTION SETUP REQUEST messageincludes an identifier of the UE 405 and a cause for RRC connectionsetup. The RRC CONNECTION SETUP message includes Signaling Radio Bearer(SRB) setup information, MAC setup information, PHY setup information,etc., SRB refers to wireless bearer for serving an RRC control message.

The UE 405 transmits an RRC CONNECTION SETUP COMPLETE message to the eNB410 at step 430. The RRC CONNECTION SETUP COMPLETE message includes aNon-Access-Stratum (NAS) message intended for an MME 415. The NASmessage includes information indicating that the capabilities of the UE405 have been altered. The capabilities of the UE 405 are stored in theMME 415. When an RRC connection is set up between the UE 405 and the eNB410, the MME 415 transmits radio communication related capability of theUE 405 to the eNB 410. This prevents the UE 405 from reporting itscapabilities to the eNB 410 each time that an RRC connection is setuptherebetween. Therefore, after the UE 405 moves from an FDD network to aTDD network or from a TDD network to an FDD network, it can report thenew UE capability information by transmitting information indicatingthat the UE capability has been altered to the corresponding network.

The eNB 410 transmits the NAS message included in the RRC CONNECTIONSETUP COMPLETE message to the MME 415 at step 435. The NAS messagerefers to control messages exchanged between the UE 405 and the MME 415.When the UE 405 is turned on, it transmits an ATTACH REQUEST NAS messageto the MME 415. If the UE 405 that has been turned on newly sets up anRRC connection, it transmits a SERVICE REQUEST NAS message to the MME415. If the UE 405 moves to a new tracking area, it transmits a TRACKINGAREA UPDATE NAS message to the MME 415. When the MME 415 receives NASmessages from the UE 405, it performs a corresponding operationaccording to the type of NAS message and information included therein.

If the MME 415 receives an NAS message including information indicatingthat the capability information of the UE 405 has been altered, the MME415 performs an INITIAL CONTEXT SETUP process with respect to the eNB410, in order to acquire the new capability information of the UE 405,at step 440. During the INITIAL CONTEXT SETUP process, the MME 415transmits information, required to provide services to the UE 405, tothe eNB 410. For example, the MME 415 may transmit, to the eNB 410,information related to security, Quality of Service (QoS), and the like.The MME 415 also transmits UE capability information related to radiocommunication to the eNB 410 during the INITIAL CONTEXT SETUP process.Since the MME 415 has recognized that the capability of the UE 405 hasbeen altered at step 440, it does not transmit the UE capabilityinformation related to radio communication to the eNB 410. Therefore,the eNB 410 can start to acquire the UE capability information. That is,when the eNB 410 may not receive the UE capability information duringthe INITIAL CONTEXT SETUP process, it can acquire the UE capabilityinformation via the following steps 445, 450, and 455. Alternatively,the eNB 410 may perform a process for acquiring UE capabilityinformation via preset conditions, e.g., after a preset period of timehas elapsed, according to an additional request, etc.

The eNB 410 transmits a control UE capability enquiry message to the UE405, which instructs the UE 405 to report its capabilities, at step 445.That is, the eNB 410 instructs the UE 405 to report its capabilityrelated to a Radio Access Technology (RAT) via the UE capability enquirymessage. Since the eNB 410 requires UE capability related to EvolvedUMTS Terrestrial Radio Access Network (E-UTRA) from the UE 405 at step445, the UE capability enquiry message may include information thatinstructs the UE 405 to report E-UTRA capability.

The UE 405 transmits its capabilities to the eNB 410 at step 450. The UEcapability information message may include a preset format of UEcapability information as shown in Table 1.

TABLE 1 UE-EUTRA-Capability ::= SEQUENCE {  accessStratumRelease  AccessStratumRelease,  ue-Category INTEGER (1..5),  pdcp-ParametersPDCP-Parameters,  phyLayerParameters   PhyLayerParameters, rf-Parameters RF-Parameters,  me asP arameters MeasParameters, featureGroupIndicators BIT STRING (SIZE (32)) OPTIONAL, interRAT-Parameters   SEQUENCE {   utraFDD  IRAT-ParametersUTRA-FDD OPTIONAL,   utraTDD128   IRAT-ParametersUTRA-TDD128  OPTIONAL,  utraTDD384   IRAT-ParametersUTRA-TDD384  OPTIONAL,   utraTDD768  IRAT-ParametersUTRA-TDD768  OPTIONAL,   geran   IRAT-ParametersGERANOPTIONAL,   cdma2000-HRPD   IRAT-ParametersCDMA2000-HRPD   OPTIONAL,  cdma2000-1xRTT    IRAT-ParametersCDMA2000-1XRTT  OPTIONAL  }, nonCriticalExtension UE-EUTRA-Capability-v920-IEs    OPTIONAL }

More detailed information regarding the entities, described in Table 1,may be acquired referring to 3GPP Technical Specification (TS) 36.331.For example, rf-Parameter includes information regarding frequency bandssupported by a UE. The frequency bands are defined as shown in Table 2.

TABLE 2 Uplink (UL) Downlink (DL) operating band operating band E-UTRABS receive BS transmit Operating UE transmit UE receive Duplex BandFUL_low FUL_high FDL_low FDL high Mode 1 1920 MHz-1980 MHz 2110 MHz-2170MHz FDD 2 1850 MHz-1910 MHz 1930 MHz-1990 MHz FDD 3 1710 MHz-1785 MHz1805 MHz-1880 MHz FDD 4 1710 MHz-1755 MHz 2110 MHz-2155 MHz FDD 5 824MHz-849 MHz 869 MHz-894MHz FDD 6 830 MHz-840 MHz 875 MHz-885 MHz FDD 72500 MHz-2570 MHz 2620 MHz-2690 MHz FDD 8 880 MHz-915 MHz 925 MHz-960MHz FDD 9 1749.9 MHz-1784.9 MHz 1844.9 MHz-1879.9 MHz FDD 10 1710MHz-1770 MHz 2110 MHz-2170 MHz FDD 11 1427.9 MHz-1447.9 MHz 1475.9MHz-1495.9 MHz FDD 12 699 MHz-716 MHz 729 MHz-746 MHz FDD 13 777 MHz-787MHz 746 MHz-756 MHz FDD 14 788 MHz-798 MHz 758 MHz-768 MHz FDD 15Reserved Reserved FDD 16 Reserved Reserved FDD 17 704 MHz-716 MHz 734MHz-746 MHz FDD 18 815 MHz-830 MHz 860 MHz-875 MHz FDD 19 830 MHz-845MHz 875 MHz-890 MHz FDD 20 832 MHz-862 MHz 791 MHz-821 MHz FDD 21 1447.9MHz-1462.9 MHz 1495.9 MHz-1510.9 MHz FDD . . . 23 2000 MHz-2020 MHz 2180MHz-2200 MHz FDD 24 1626.5 MHz-1660.5 MHz 1525 MHz-1559 MHz FDD 25 1850MHz-1915 MHz 1930 MHz-1995 MHz FDD . . . 33 1900 MHz-1920 MHz 1900MHz-1920 MHz TDD 34 2010 MHz-2025 MHz 2010 MHz-2025 MHz TDD 35 1850MHz-1910 MHz 1850 MHz-1910 MHz TDD 36 1930 MHz-1990 MHz 1930 MHz-1990MHz TDD 37 1910 MHz-1930 MHz 1910 MHz-1930 MHz TDD 38 2570 MHz-2620 MHz2570 MHz-2620 MHz TDD 39 1880 MHz-1920 MHz 1880 MHz-1920 MHz TDD 40 2300MHz-2400 MHz 2300 MHz-2400 MHz TDD 41 2496 MHz-2690 MHz 2496 MHz-2690MHz TDD 42 3400 MHz-3600 MHz 3400 MHz-3600 MHz TDD 43 3600 MHz-3800 MHz3600 MHz-3800 MHz TDD

The UE 405 reports the number of frequency bands that it supports, viarf-Parameters. The frequency bands are classified into an FDD band and aTDD band. If the UE 405 supports only an FDD band, it is a UE thatoperates in an FDD band. Likewise, if the UE 405 supports only a TDDband, it is a UE that operates in a TDD band. If the UE 405 supportsboth the FDD and the TDD bands, it is a dual mode UE that operates inboth the FDD bands and the TDD bands.

The featureGroupIndicators refers to information showing whether the UE405 is subjected to an IOT with respect to a feature group. ThefeatureGroupIndicators is described in more detail as shown in Table 3.The features included in featureGroupIndicators refer to mandatoryfeatures that the UE must implement. For example, if the UE sets bit 3of Feature Group Indicator (FGI) to ‘1,’ this means that it hasimplemented 5 bit RLC Unacknowledge Mode (UM) Sequence Number (SN) and 7bit PDCP SN and has also been subjected to the IOT.

TABLE 3 Index of indicator (bit Definition number) (description of thesupported functionality, if indicator set to one) 1 (leftmost bit) -Intra-subframe frequency hopping for PUSCH scheduled by UL grant - DCIformat 3a (TPC commands for PUCCH and PUSCH with single bit poweradjustments) - PDSCH transmission mode 5 - Aperiodic CQI/PMI/RIreporting on PUSCH: Mode 2-0 - UE selected subband CQI without PMI -Aperiodic CQI/PMI/RI reporting on PUSCH: Mode 2-2 - UE selected subbandCQI with multiple PMI 2 - Simultaneous CQI and ACK/NACK on PUCCH, i.e.PUCCH format 2a and 2b - Absolute TPC command for PUSCH - Resourceallocation type 1 for PDSCH - Periodic CQI/PMI/RI reporting on PUCCH:Mode 2-0 - UE selected subband CQI without PMI - Periodic CQI/PMI/RIreporting on PUCCH: Mode 2-1 - UE selected subband CQI with single PMI3 - 5 bit RLC UM SN - 7 bit PDCP SN 4 - Short DRX cycle 5 - Long DRXcycle - DRX command MAC control element 6 - Prioritized bit rate 7 -RLCUM 8 - EUTRA RRC_CONNECTED to UTRA CELL_DCH PS handover 9 - EUTRARRC_CONNECTED to GERAN GSM_Dedicated handover 10 - EUTRA RRC_CONNECTEDto GERAN (Packet_) Idle by Cell Change Order - EUTRA RRC_CONNECTED toGERAN (Packet_) Idle by Cell Change Order with NACC (Network AssistedCell Change) 11 - EUTRA RRC_CONNECTED to CDMA2000 1xRTT CS Activehandover 12 - EUTRA RRC_CONNECTED to CDMA2000 HRPD Active handover 13 -Inter-frequency handover (within FDD or TDD) 14 - Measurement reportingevent: Event A4 - Neighbor > threshold - Measurement reporting event:Event AS - Serving < threshold1 & Neighbor > threshold2 15 - Measurementreporting event: Event B1 - Neighbor > threshold 16 - non-ANR relatedintra-frequency periodical measurement reporting; - non-ANR relatedinter-frequency periodical measurement reporting, if the UE has set bitnumber 25 to 1; and - non-ANR related inter-RAT periodical measurementreporting for UTRAN, GERAN, 1xRTT or HRPD, if the UE has set bit number22, 23, 24 or 26 to 1, respectively. 17 - Periodical measurementreporting for SON / ANR - ANR related intra-frequency measurementreporting events 18 - ANR related inter-frequency measurement reportingevents 19 - ANR related inter-RAT measurement reporting events 20 If bitnumber 7 is set to 0: - SRB1 and SRB2 for DCCH + 8x AM DRB If bit number7 is set to 1: - SRB1 and SRB2 for DCCH + 8x AM DRB - SRB1 and SRB2 forDCCH + 5x AM DRB + 3x UM DRB 21 - Predefined intra- and inter-subframefrequency hopping for PUSCH with N_sb > 1 - Predefined inter-subframefrequency hopping for PUSCH with N_sb > 1 22 - UTRAN measurements,reporting and measurement reporting event B2 in E-UTRA connected mode23 - GERAN measurements, reporting and measurement reporting event B2 inE-UTRA connected mode 24 - 1xRTT measurements, reporting and measurementreporting event B2 in E-UTRA connected mode 25 - Inter-frequencymeasurements and reporting in E-UTRA connected mode NOTE: The UE settingthis bit to 1 and indicating support for FDD and TDD frequency bands inthe UE capability signaling implements and is tested for FDDmeasurements while the UE is in TDD, and for TDD measurements while theUE is in FDD. 26 - HRPD measurements, reporting and measurementreporting event B2 in E-UTRA connected mode 27 - EUTRA RRC_CONNECTED toUTRA CELL_DCH CS handover 28 - TTI bundling 29 - Semi-PersistentScheduling 30 - Handover between FDD and TDD 31 Undefined 32 Undefined

If the dual mode UE supports a feature group in FDD and TDD modes andhas been subjected to an IOT for the feature group in the modes, it canset FGI for a corresponding feature group to ‘1.’ However, it frequentlyoccurs that, although the dual mode UE has been subjected to an IOT inan FDD mode, it may not have been subjected to the IOT in a TDD mode orvice versa. In that case, the UE 405 cannot determine how to set up FGIfor a corresponding feature group. In order to address the problem, theUE 405 reports two sets of FGIs (sets of FGI bits as described in Table3). One set of FGI indicates whether the UE 405 has been subjected to anIOT in an FDD mode (hereinafter called an FDD FGI set), and the otherset of FGI indicates whether the UE 405 has been subjected to an IOT ina TDD mode (hereinafter called a TDD FGI set).

When the UE 405 transmits two sets of FGIs via a network, if the eNB 410and the MME 415 are adapted to a system of the previous release version,they cannot detect part of the received information. If the UE 405 isaware of the release version of the eNB 410 or the network, it cantransmit FGI corresponding to the release version. However, since thecurrent system does not provide information to infer the release versionof the eNB 410 or the network, sets of FGIs must be defined consideringthat the eNB 410 may not detect information in a new format.

In order to address the problems described above, the field thatincludes information regarding a set of FGI is determined, referring toa mode of a network (or the eNB 410) to which the UE 405 has establisheda connection. That is, the UE 405 includes one FGI set in a legacy field(or a default field) and the other FGI set in an extension field. Inthat case, although a network does not detect the extension field, itcan detect FGI in a legacy field. Therefore, a corresponding operationcan be executed based on the detected information. If a duplex mode of anetwork where a connection has been currently established differs fromthat of an FGI set included in a legacy field, the eNB 410 maymistakenly judge the capability of the UE 405. To address this problem,the UE 405 refers to a mode of a network where a connection has beenestablished at a time point when it reports the capability information,and includes an FGI set of a corresponding mode in a legacy field and anFGI set of the other mode in an extension field. Table 4 describes aconventional Information Entity (IE) for FGI and an IE for FGI of anextension field. It should be understood that Table 4 shows one of theexemplary embodiments.

TABLE 4 UE-EUTRA-Capability ::= SEQUENCE {  accessStratumRelease AccessStratumRelease,  ue-Category  INTEGER (1..5),  pdcp-Parameters PDCP-Parameters,  phyLayerParameters  PhyLayerParameters, rf-Parameters  RF-Parameters,  measParameters  MeasParameters, featureGroupIndicators  BIT STRING (SIZE (32)) ==featureGroupIndicator, applied to the existing IE and the current duplexmode ==  interRAT-Parameters  SEQUENCE {   utraFDD  IRAT-ParametersUTRA-FDD  OPTIONAL,   utraTDD128  IRAT-ParametersUTRA-TDD128 OPTIONAL,   utraTDD384  IRAT-ParametersUTRA-TDD384 OPTIONAL,   utraTDD768  IRAT-ParametersUTRA-TDD768 OPTIONAL,   geran   IRAT-ParametersGERANOPTIONAL,   cdma2000-HRPD   IRAT-ParametersCDMA2000-HRPD  OPTIONAL,  cdma2000-1xRTT    IRAT-ParametersCDMA2000-1XRTT  OPTIONAL  }, nonCriticalExtension UE-EUTRA-Capability-v920-IEs  OPTIONAL }UE-EUTRA-Capability-v11xy-IEs ::= SEQUENCE {  featureGroupIndicators  BIT STRING (SIZE (32)) == featureGroupIndicator, applied to newlyextended IE and a duplex mode that differs from the current duplex mode== }

If the dual mode UE 405 has set up a connection with an FDD network(i.e., if the UE 405 is connected to the eNB 410 operating in an FDDband), it may include an FDD FGI set in a legacy field and a TDD FGI setin an extension field. Alternatively, if the dual mode UE 405 has set upa connection with a TDD network (i.e., if the UE 405 is connected to theeNB 410 operating in a TDD band), it may include a TDD FGI set in alegacy field and an FDD FGI set in an extension field.

The eNB 410 includes the UE capability information, received at step450, in a UE CAPABILITY INFO INDICATION control message and transmitsthe message to the MME 415 at step 455. The MME 415 stores the receivedUE capability information and uses it during the INITIAL CONTEXT SETUPprocess. The eNB 410 can determine setting information that will beapplied to the UE 405, referring to the UE capability informationtransmitted from the UE 405.

FIG. 5 illustrates a flowchart that describes a method for transmittingcapability information by a UE, according to a first exemplaryembodiment of the invention.

Referring to FIG. 5, an event occurs in a dual mode UE 405 such that itneeds to newly report its capability information to an eNB 410 at step505. The UE 405 performs an RRC CONNECTION SETUP process with respect tothe eNB 410 at step 510. When the UE 405 establishes an RRC connectionwith the eNB 410, it generates an RRC CONNECTION SETUP COMPLETE messageand transmits it to the eNB 410 at step 515. The RRC CONNECTION SETUPCOMPLETE message may include NAS messages, such as ATTACH REQUEST,Tracking Area Update (TAU), SERVICE REQUEST, and the like. The UE 405may include information indicating that the UE radio capability has beenaltered in the NAS message.

After transmitting the RRC CONNECTION SETUP COMPLETE message to the eNB410, the UE 405 may execute corresponding functions at step 520. Inorder to acquire new UE capability information regarding the UE 405, theeNB 410 may transmit a UE capability enquiry message to the UE 405 asdescribed above, referring to FIG. 4. The message may includeinformation that instructs the UE 405 to report E-UTRA capability.

When the UE 405 receives the message from the eNB 410 at step 520, itdetermines whether the mode of the current network is an FDD or TDD modeat step 525. That is, the UE 405 determines whether the operating bandof the current cell is an FDD or TDD band. Alternatively, the UE 405determines whether its current operating band is an FDD or TDD band.Since the current operating band of the UE 405 always matches theoperating band of the current cell, the two determining processes aresubstantially identical to each other. Alternatively, the UE 405 mayhave previously determined the mode of the current network at step 505.That is, the UE 405 may execute the processes following step 525, basedon the mode of the network at a time point that it needs to report thecapability information.

If it is determined that the mode of the current network is an FDD modeat step 525, the UE 405 includes an FDD FGI set (i.e., informationshowing whether an IOT test has been performed in an FDD mode) in alegacy field (which can be understood by a conventional network), and aTDD FGI set (i.e., information showing whether an IOT test has beenperformed in a TDD mode) in an extension field (which can be understoodby a network of a new release version, e.g., Release 10 or Release 11)at step 530. The UE 405 may perform the processes, taking intoconsideration whether an FDD FGI set and a TDD FGI set are identical toeach other. That is, if the FDD FGI set and the TDD FGI set differ fromeach other, the UE 405 reports them to the eNB 410. If the FDD FGI setand the TDD FGI set are identical to each other, the UE 405 reports oneof them to the eNB 410. Alternatively, the UE 405 may perform theprocesses, taking into consideration whether the FDD capabilityinformation is identical to the TDD capability information. For example,if the FDD capability information (e.g., the FDD FGI set) differs fromthe TDD capability information (e.g., the TDD FGI set), the UE 405reports the two sets to the eNB 410. If the FDD capability information(e.g., the FDD FGI set) is identical to the TDD capability information(e.g., the TDD FGI set), the UE 405 may not include an extension field.Therefore, if the eNB 410 receives capability information including oneFGI set, it concludes that the received capability information can beapplied to both TDD and FDD.

On the contrary, if it is determined that the mode of the currentnetwork is a TDD mode at step 525, the UE 405 includes a TDD FGI set ina legacy field (which can be understood by a conventional network), andan FDD FGI set (i.e., information showing whether an IOT test has beenperformed in an FDD mode) in an extension field (which can be understoodby a network of a new release version, e.g., Release 10 or Release 11)at step 535. The UE 405 may perform the processes, taking intoconsideration whether an FDD FGI set and a TDD FGI set are identical toeach other. That is, if the FDD FGI set and the TDD FGI set differ fromeach other, the UE 405 reports them to the eNB 410. If the FDD FGI setand the TDD FGI set are identical to each other, the UE 405 reports oneof them to the eNB 410. Alternatively, the UE 405 may perform theprocesses, taking into consideration whether the FDD capabilityinformation is identical to the TDD capability information. For example,if the FDD capability information (e.g., the FDD FGI set) differs fromthe TDD capability information (e.g., the TDD FGI set), the UE 405reports the two sets to the eNB 410. If the FDD capability information(e.g., the FDD FGI set) is identical to the TDD capability information(e.g., the TDD FGI set), the UE 405 may not include an extension field.Therefore, if the eNB 410 receives capability information including oneFGI set, it concludes that the received capability information can beapplied to TDD and FDD.

The UE 405 transmits the UE capability information, includinginformation generated at steps 530 or 535, to the eNB 410 at step 540.

The UE 405 can report the FGI sets and the other information. Forexample, the UE 405 may report information related to other capabilitiesthat depend on whether an IOT test is performed or whether it can besupported (e.g., a feature indicating whether it can be supported viaphyLayerParameters or interRAT-Parameters). The UE 405 may also reportinformation related to the other capabilities, information regardingFDD, and information regarding TDD. During this process, the UE 405includes capability information, supported in a mode of the currentnetwork, in a legacy related-field, and also capability information,supported in a mode other than the mode of the current network, in anextension field, and then reports them.

FIG. 6 illustrates a flowchart that describes a method for reportingcapability information by a UE according to a second exemplaryembodiment of the present invention.

A conventional UE reports all frequency bands that it supports viarf-Parameters, and also reports a measurement gap requirement forrespective frequency bands via measParameters.

In the second exemplary embodiment of the invention, the UE 405determines information to be included in rf-Parmeters andmeasParameters, considering a mode of a current serving network. If theUE 405 is connected to an FDD network, it reports FDD bands and themeasurement gap requirement for the FDD bands, via a legacy field, e.g.,rf-Parameters and measParameters. The UE 405 reports informationregarding a mode, different from that of a current serving network, viaan extension field (e.g., rf-Parameters and measParameters defined as alower field of a UE-EUTRA-Capability-v11xy-IEs field).

As such, since a UE according to exemplary embodiments of the presentinvention operates in an FDD band and a TDD band separately, it cancommunicate with an eNB of the previous release without malfunction.That is, if an FDD band and a TDD band were reported to a legacy fieldbut an FGI reports information regarding only one of the two bands, aneNB of the previous release may make a mistake in determining a featuregroup with respect to the mobility. For example, FGI 25 is related tointer-frequency for E-UTRA bands. Although the UE 405 has set FGI 25 offeatureGroupIndicators of UE-EUTRA-Capability as a legacy related-fieldto ‘1’ in order to indicate that it has been subjected to an IOT forinter-frequency measurement with respect to the FDD bands, if the FDDbands and TDD bands are reported via rf-Parameters of the legacyrelated-field, the eNB of the previous release may mistakenly determinethat the UE 405 has been subjected to an IOT for inter-frequencymeasurement with respect to all bands including FDD bands and TDD bands.Therefore, exemplary embodiments of the invention report bands withrespect to modes.

Referring to FIG. 6, an event occurs in a dual mode UE 405 such that itneeds to newly report its capability information at step 605. The UE 405performs an RRC CONNECTION SETUP process with respect to the eNB at step610. When the UE 405 establishes an RRC connection with the eNB, itgenerates an RRC CONNECTION SETUP COMPLETE message and transmits themessage to the eNB 410 at step 615. The message may include NASmessages, such as ATTACH REQUEST, Tracking Area Update (TAU), SERVICEREQUEST, and the like. The UE 405 may include information indicatingthat the UE radio capability has been altered in the NAS message.

After transmitting an RRC CONNECTION SETUP COMPLETE message to the eNB410, the UE 405 may execute corresponding functions at step 620. Inorder to acquire new UE capability information regarding the UE 405, theeNB 410 may transmit a UE capability enquiry message to the UE 405 asdescribed above, referring to FIG. 4. The message may includeinformation that instructs the UE 405 to report E-UTRA capability.

When the UE 405 receives the message from the eNB 410 at step 620, itdetermines whether the mode of the current network is an FDD or TDD modeat step 625. That is, the UE 405 determines whether the operating bandof the current cell is an FDD or TDD band. Alternatively, the UE 405determines whether its current operating band is an FDD or TDD band.Since the current operating band of the UE 405 always matches theoperating band of the current cell, the two determining processes aresubstantially identical to each other. Alternatively, the UE 405 mayhave previously determined the mode of the current network at step 605.That is, the UE 405 may execute the processes following step 525, basedon the mode of the network at a time point that it needs to report thecapability information.

If it is determined that the mode of the current network is an FDD modeat step 625, the UE 405 includes an FDD FGI set, FDD bands that itsupports, a measurement gap requirement for the FDD bands, etc., in alegacy field (which can be understood by a conventional network), andalso a TDD FGI set (i.e., information showing whether an IOT test hasbeen performed in a TDD mode), TDD bands that it supports, a measurementgap requirement for the TDD bands, etc., in an extension field at step630.

Table 5 describes an example of an IE that can be used at step 630.

TABLE 5 UE-EUTRA-Capability ::=   SEQUENCE { access StratumReleaseAccessStratumRelease, ue-Category INTEGER (1..5), pdcp-ParametersPDCP-Parameters, phyLayerParameters PhyLayerParameters, rf-ParametersRF-Parameters, == Only FDD bands areincluded == measParametersMeasParameters, == measurement gap requirement for FDD bands ==featureGroupIndicators BIT STRING (SIZE (32)) == featureGroupIndicatorof FDD == interRAT-Parameters SEQUENCE { utraFDD IRAT-ParametersUTRA-FDD OPTIONAL, utraTDD128 IRAT-ParametersUTRA-TDD128 OPTIONAL, utraTDD384IRAT-ParametersUTRA-TDD384 OPTIONAL, utraTDD768IRAT-ParametersUTRA-TDD768 OPTIONAL, geran IRAT-ParametersGERANOPTIONAL, cdma2000-HRPD IRAT-ParametersCDMA2000-HRPD  OPTIONAL,cdma2000-1xRTT  IRAT-ParametersCDMA2000-1XRTT   OPTIONAL },nonCriticalExtension UE-EUTRA-Capability-v920-IEs  OPTIONAL }UE-EUTRA-Capability-v11xy-IEs ::=  SEQUENCE { rf-Parameters RF-Parameters, == Only TDD bands are included  == measParameters MeasParameters, == measurement gap requirement for TDD bands ==featureGroupIndicators  BIT STRING (SIZE (32)) == featureGroupIndicatorof TDD == }

Mobility-related bits of the FGI bits, e.g., FGI 8, 9, 10, 11, 25, etc.,have different meanings according to positions wherefeatureGroupIndicators are stored and according to information includedin the stored rf-Parameters, as follows.

-   -   Mobility-related FGIs of the featureGroupIndicators in a legacy        field indicate the requirement of an IOT with respect to only        the bands included in the rf-Parameters of a legacy field.    -   Mobility-related FGIs of the featureGroupIndicators in an        extension field report the requirement of an IOT with respect to        items that were not reported via FGI of a legacy related-field,        considering bands included in the rf-Parameters of an extension        field and bands included in the rf-Parameters of a legacy        related-field.

For example, if the UE 405 locates, in a legacy field, an rf-Parameterincluding an FDD band (or a TDD band at step 635) and an FGI related toan FDD (or TDD) mode, and also, in an extension field, an rf-Parameterincluding a TDD band (or an FDD band) and an FGI related to a TDD (or anFDD at step 635) mode,

-   -   a mobility-related FGI bit in a legacy field, e.g., FGI 25,        indicates the requirement of an IOT test for the following case.        -   the requirement of an IOT test for inter-frequency            measurement with respect to an FDD (or TDD at step 635) band            in an FDD (or TDD at step 635) band.    -   a mobility-related FGI bit in an extension field, e.g., FGI 25,        indicates the requirement of an IOT test for the following cases        (i.e., of the four total cases, reports are made regarding three        cases except for one case that was reported via a legacy        related-field).        -   the requirement of an IOT test as to whether inter-frequency            measurement is performed with respect to a TDD (or FDD at            step 635) band in an FDD (or TDD at step 635) band.        -   the requirement of an IOT test as to whether inter-frequency            measurement is performed with respect to a TDD (or FDD at            step 635) band in a TDD (or FDD at step 635) band.        -   the requirement of an IOT test as to whether inter-frequency            measurement is performed with respect to an FDD (or TDD at            step 635) band in a TDD (or FDD at step 635) band.

Meanwhile, if it is determined that the mode of the current network is aTDD mode at step 625, the UE 405 includes a TDD FGI set (i.e.,information showing whether an IOT test has been performed in a TDDmode), TDD bands that it supports, a measurement gap requirement for theTDD bands, etc., in a legacy field (which can be understood by aconventional network), and also an FDD FGI set (i.e., informationshowing whether an IOT test has been performed in an FDD mode), FDDbands that it supports, measurement gap requirement for the FDD bands,etc., in an extension field at step 635.

The UE 405 transmits the UE capability information, includinginformation generated at steps 630 or 635, to the eNB 410 at step 640.

FIG. 7 illustrates a flowchart that describes a method for reportingcapability information via a UE according to a third exemplaryembodiment of the present invention.

The third exemplary embodiment of the present invention provides amethod for supporting features and FGI sets and indicating therequirement of an IOT test in respective duplex modes.UE-EUTRA-Capability includes an FGI bit, parameters related to bandsthat the UE supports (rf-Parameters), a parameter related to a peak datarate of the UE (ue-Category), parameters related to physical layercapability (phyLayerParameters), parameters related to other radioaccess technology (interRAT-Parameters), etc. In the third exemplaryembodiment of the present invention, UE-EUTRA-Capability is managed asthe following three examples.

-   -   UE-EUTRA-Capability 1: this refers to UE-EUTRA-Capability that        is determined considering only an FDD band. That is, the UE 405        includes only FDD bands that it supports in the rf-Parameter and        configures an FGI bit of an FGI set in such a way to indicate        whether a corresponding feature group is subjected to an IOT        test in an FDD band. When the UE 405 reports whether it supports        optional features, e.g., a number of features included in        phyLayerParameters, it reports only the features that are        supported in FDD bands and have been subjected to an IOT test.    -   UE-EUTRA-Capability 2: this refers to UE-EUTRA-Capability that        is determined considering only a TDD band. That is, the UE 405        includes only TDD bands that it supports in the rf-Parameter and        configures an FGI bit of an FGI set in such a way to indicate        whether a corresponding feature group is subjected to an IOT        test in a TDD band. When the UE 405 reports whether it supports        optional features, e.g., a number of features included in        phyLayerParameters, it reports only the features that are        supported in TDD bands and have been subjected to an IOT test.    -   UE-EUTRA-Capability 3: this refers to UE-EUTRA-Capability that        is determined considering both FDD and TDD bands. That is, the        UE 405 includes all bands that it supports in the rf-Parameter        and configures an FGI bit in such a way to indicate whether a        corresponding feature group is subjected to an IOT test in one        or more FDD bands and one or more TDD bands, from among all the        bands that it supports. When the UE 405 reports whether it        supports optional features, e.g., a number of features included        in phyLayerParameters, it reports the features that are        supported in both FDD and TDD bands and have been subjected to        an IOT test.

The three capabilities described above may be identical to each other ordiffer from each other. If IOT environments for FDD and TDD may differfrom each other or different types of features with respect to FDD andTDD are supported, the capabilities have different values respectively.

The UE 405 determines capability information to be reported, accordingto a mode of a network at a time point that it transmits UE capabilityinformation. For example, the UE 405 reports UE-EUTRA-Capability 1 andUE-EUTRA-Capability 3 via an FDD network and UE-EUTRA-Capability 2 andUE-EUTRA-Capability 3 via a TDD network.

Referring to FIG. 7, an event occurs in a dual mode UE 405 such that itneeds to newly report its capability information at step 705. The UE 405performs an RRC CONNECTION SETUP process with respect to the eNB 410 atstep 710. When the UE 405 establishes an RRC connection with the eNB410, it generates an RRC CONNECTION SETUP COMPLETE message and transmitsit to the eNB 410 at step 715. The message may include NAS messages,such as ATTACH REQUEST, Tracking Area Update (TAU), SERVICE REQUEST, andthe like. The UE 405 may include information indicating that the UEradio capability has been altered in the NAS message.

After transmitting the RRC CONNECTION SETUP COMPLETE message to the eNB410, the UE 405 may execute corresponding functions at step 720. Inorder to acquire new UE capability information regarding the UE 405, theeNB 410 may transmit a UE capability enquiry message to the UE 405 asdescribed above, referring to FIG. 4. The message may includeinformation that instructs the UE 405 to report EUTRA capability.

When the UE 405 receives the message from the eNB 410 at step 720, itdetermines whether the mode of the current network is an FDD or TDD modeat step 725. That is, the UE 405 determines whether the operating bandof the current cell is an FDD or TDD band. Alternatively, the UE 405determines whether its current operating band is an FDD or TDD band.Since the current operating band of the UE 405 always matches theoperating band of the current cell, the two determining processes aresubstantially identical to each other. Alternatively, the UE 405 mayhave previously determined the mode of the current network at step 705.That is, the UE 405 may execute the processes, based on the mode of thenetwork at a time point that it needs to report the capabilityinformation.

If it is determined that the mode of the current network is an FDD modeat step 725, the UE 405 generates the UE capability information messageat step 730. The UE capability information message includes, of theEUTRA-Capability-1, serving as capability information applicable to FDD,and EUTRA-Capability-2, serving as capability information applicable toTDD, UE-EUTRA-Capability-1, serving as capability information applicableto FDD corresponding to a mode of the current network, in a legacyfield, and UE-EUTRA-Capability-3, serving as capability informationapplicable to FDD and TDD, in an extension field. If capabilityinformation applicable to one duplex mode (i.e., EUTRA-Capability-1 orEUTRA-Capability-2) differs from capability information commonlyapplicable to the two duplex modes (i.e., EUTRA-Capability-3), the UE405 reports the information regarding the two capabilities. On thecontrary, if capability information applicable to one duplex mode (i.e.,EUTRA-Capability-1 or EUTRA-Capability-2) is identical to capabilityinformation commonly applicable to the two duplex modes (i.e.,EUTRA-Capability-3), the UE 405 reports information regarding one of thetwo capabilities. Therefore, if the eNB 410 receives capabilityinformation including one FGI set, it concludes that the receivedcapability information can be applied to both TDD and FDD.

On the contrary, if it is determined that the mode of the currentnetwork is a TDD mode at step 725, the UE 405 generates the UEcapability information message at step 735. The UE capabilityinformation message includes, of the EUTRA-Capability-1, serving ascapability information applicable to FDD, and EUTRA-Capability-2,serving as capability information applicable to TDD,UE-EUTRA-Capability-2, serving as capability information applicable toTDD corresponding to a mode of the current network, in a legacy field,and UE-EUTRA-Capability-3, serving as capability information applicableto FDD and TDD, in an extension field. If capability informationapplicable to one duplex mode (i.e., EUTRA-Capability-1 orEUTRA-Capability-2) differs from capability information commonlyapplicable to the two duplex modes (i.e., EUTRA-Capability-3), the UE405 reports the information regarding the two capabilities. On thecontrary, if capability information applicable to one duplex mode (i.e.,EUTRA-Capability-1 or EUTRA-Capability-2) is identical to capabilityinformation commonly applicable to the two duplex modes (i.e.,EUTRA-Capability-3), the UE 405 reports information regarding one of thetwo capabilities.

The UE 405 transmits the UE capability information, includinginformation generated at steps 730 or 735, to the eNB 410 at step 740.

FIG. 8 illustrates a schematic block diagram of a UE according to anexemplary embodiment of the present invention.

Referring to FIG. 8, the UE 405 includes a transceiver 805, a controller810, a multiplexer and demultiplexer 820, a control message processor835, and upper layer devices 825 and 830.

The transceiver 805 receives data and control signals via the forwardchannel of a serving cell and transmits data and control signals via thereverse channel.

The multiplexer and demultiplexer 820 multiplexes data from the controlmessage processor 835 or the upper layer devices 825 and 830 orde-multiplexes data from the transceiver 805, and transfers theprocessed data to the control message processor 835 or the upper layerdevices 825 and 830.

The control message processor 835 refers to an RRC layer device. Thecontrol message processor 835 processes control messages transmittedfrom eNB 410 and performs corresponding operations. For example, thecontrol message processor 835 receives an RRC control message, andtransfers, if the RRC control message includes DRX-related informationor SPS-related information, the included information to the controller810. The control message processor 835 processes the control messages sothat the UE 405 can report the capability information as described abovereferring to FIGS. 4 to 7. The control message processor 835 cangenerate UE capability information according to the exemplaryembodiments described above. The exemplary embodiments may be modifiedin such a way that the controller 810 generates UE capabilityinformation.

The upper layer devices 825 and 830 may be configured according to typesof services. For example, the upper layer devices 825 and 830 processdata, generated when user services such as File Transfer Protocol (FTP)or Voice over Internet Protocol (VoIP) services are provided, andtransfer them to the multiplexer and demultiplexer 820. The upper layerdevices 825 and 830 may also process data, from the multiplexer anddemultiplexer 820, and transfer data to the upper layer serviceapplication.

The controller 810 receives a scheduling command via the transceiver805, identifies the reverse grants, and controls the transceiver 805 andthe multiplexer and demultiplexer 820 to transmit them as a propertransmission resource, in the reverse direction, at a proper time point.The controller 810 also sets up functions, referring to settinginformation transmitted from the control message processor 835. Thecontroller 810 can control operations so that the UE 405 can report itscapability information as described above referring to FIGS. 4 to 7.

FIG. 9 illustrates a schematic block diagram of an eNB according to anexemplary embodiment of the present invention

Referring to FIG. 9, the eNB 410 includes a transceiver 905, acontroller 910, a multiplexer and demultiplexer 920, a control messageprocessor 935, upper layer devices 925 and 930, and a scheduler 915.

The transceiver 905 transmits data and control signals via the forwardcarriers and receives data and control signals via the reverse carriers.

The multiplexer and demultiplexer 920 multiplexes data from the controlmessage processor 935 or the upper layer devices 925 and 930 orde-multiplexes data from the transceiver 905, and transfers theprocessed data to the control message processor 935, the upper layerdevices 925 and 930, or the controller 910.

The control message processor 935 processes control messages from the UE405 and performs corresponding operations. The control message processor935 also generates control messages to be transmitted to the UE 405 andtransfers them to the lower layer. The control message processor 935generates a UE CAPABILITY ENQUIRY message to be transmitted to the UE405, processes UE CAPABILITY INFORMATION transmitted from the UE 405,and determines a function to set the UE 405 based on the processedinformation. The control message processor 935 generates an RRCCONNECTION RECONFIGURATION message based on the determination andtransfers it to the multiplexer and demultiplexer 920.

The upper layer devices 925 and 930 may be configured according tobearers. The upper layer devices 925 and 930 configure data, transmittedfrom S-GW 130 or the other eNB, to RLC PDU, and transfer it to themultiplexer-demultiplexer 920. The upper layer devices 925 and 930configure RLC PDU, transmitted from the multiplexer-demultiplexer 920,to PDCP SDU, and transfer it to the S-GW 130 or the other eNB.

The scheduler 915 allocates transmission resources to the UE 405 at aproper time point, considering the buffer state, the channel state, etc.The scheduler 915 processes signals transmitted from or to the UE.

The controller 910 controls operations of the eNB 410 to receive UEcapability information from the UE 405 according to one of the exemplaryembodiments as described referring to FIGS. 4 to 7.

More particularly, the eNB 410 receives UE capability information,extracts information regarding a corresponding capability, consideringthe mode where the UE capability is reported, and accordinglycommunicates with the UE 405.

As described above, the system and method according to exemplaryembodiments of the invention can allow a dual mode UE to efficientlyreport its capability information.

In addition, it should be understood that the exemplary processes andoperations of the mobile device, described above, can be performed viacomputer programming instructions. These computer programminginstructions can be installed in processors of data processing equipmentthat can be programmed, special computers, or universal (e.g., generalpurpose) computers. The instructions, performed via the processors ofdata processing equipment or the computers, can generate means thatperform functions described in blocks of the flowchart. In order toimplement functions in a particular mode, the computer programminginstructions can also be stored in a computer available memory orcomputer readable memory that can support computers or data processingequipment that can be programmed. Therefore, the instructions, stored inthe computer available memory or computer readable memory, can beinstalled to the products, and perform the functions therein, describedin the blocks of the flowchart therein. In addition, since the computerprogramming instructions can also be installed to computers or dataprocessing equipment that can be programmed, they can create processesthat perform a series of operations therein, described in the blocks ofthe flowchart therein.

The blocks of the flowcharts refer to parts of codes, segments ormodules that include one or more executable instructions to perform oneor more logic functions. It should be noted that the functions describedin the blocks of the flowcharts may be performed in a different orderfrom the exemplary embodiments described above. For example, thefunctions described in two adjacent blocks may be performed at the sametime or in reverse order.

In the exemplary embodiments, the terminology, component ‘˜ unit,’refers to a software element or a hardware element such as a FieldProgrammable Gate Array (FPGA), an Application Specific IntegratedCircuit (ASIC), etc., and performs a corresponding function. It shouldbe, however, understood that the component ‘˜unit’ is not limited to asoftware or hardware element. The component ‘˜unit’ may be implementedin storage media that can be designated by addresses. The component‘˜unit’ may also be configured to regenerate one or more processors. Forexample, the component ‘˜unit’ may include various types of elements(e.g., software elements, object-oriented software elements, classelements, task elements, etc.), segments (e.g., processes, functions,achieves, attribute, procedures, sub-routines, program codes, etc.),drivers, firmware, micro-codes, circuit, data, data base, datastructures, tables, arrays, variables, etc. Functions provided byelements and the components ‘˜units’ may be formed by combining thesmall number of elements and components ‘˜units’ or may be divided intoadditional elements and components ‘˜units.’ In addition, elements andcomponents ‘˜units’ may also be implemented to regenerate one or moreCPUs in devices or security multi-cards.

The terms or words described in the description and the claims shouldnot be limited by a general or lexical meaning, but instead should beanalyzed as a meaning and a concept through which the inventor definesand describes the invention, to comply with the idea of the invention.Therefore, one skilled in the art will understand that the exemplaryembodiments disclosed in the description and configurations illustratedin the drawings are only exemplary embodiments, and that there may bevarious modifications, alterations, and equivalents thereof to replacethe exemplary embodiments at the time of filing this application.

While the invention has been shown and described with reference tocertain exemplary embodiments thereof, it will be understood by thoseskilled in the art that various changes in form and details may be madetherein without departing from the spirit and scope of the invention asdefined in the appended claims and their equivalents.

What is claimed is:
 1. A method for transmitting user equipment (UE)capability information, the method comprising: receiving a messagerequesting UE capability information; identifying first capabilityinformation and second capability information according to the receivedmessage, the first capability information being applicable to either afrequency division duplex (FDD) mode or a time division duplex (TDD)mode and the second capability information being applicable to both theFDD mode and the TDD mode; and transmitting a UE capability informationmessage including at least one of a first field for the first capabilityinformation and a second field for the second capability information,wherein the first capability information and the second capabilityinformation comprise at least one of a feature group indicator (FGI), UEspecific reference signal information, a measurement gap requirement,and a physical layer parameter.
 2. The method of claim 1, wherein the UEcapability information message includes both the first field and thesecond field if the first capability information is different from thesecond capability information.
 3. The method of claim 1, wherein the UEcapability information message includes either the first field or thesecond field if the first capability information and the secondcapability information have the same value.
 4. A User Equipment (UE)comprising: a transceiver configured to: receive a message requesting UEcapability information, and transmit a UE capability information messageincluding at least one of a first field for the first capabilityinformation and a second field for the second capability information;and a controller configured to identify first capability information andsecond capability information according to the received message, thefirst capability information being applicable to either a frequencydivision duplex (FDD) mode or a time division duplex (TDD) mode and thesecond capability information being applicable to both the FDD mode andthe TDD mode, wherein the first capability information and the secondcapability information comprise at least one of a feature groupindicator (FGI), UE specific reference signal information, a measurementgap requirement, and a physical layer parameter.
 5. The UE of claim 4,wherein the UE capability information message includes both the firstfield and the second field if the first capability information isdifferent from the second capability information.
 6. The UE of claim 4,wherein the UE capability information message includes either the firstfield or the second field if the first capability information and thesecond capability information have the same value.
 7. A method forreceiving user equipment (UE) capability information, the methodcomprising: transmitting a message requesting UE capability information;and receiving a UE capability information message including at least oneof a first field for the first capability information and a second fieldfor the second capability information, in response to the requestmessage, wherein the first capability information being applicable toeither a frequency division duplex (FDD) mode or a time division duplex(TDD) mode and the second capability information being applicable toboth the FDD mode and the TDD mode, wherein the first capabilityinformation and the second capability information comprise at least oneof a feature group indicator (FGI), UE specific reference signalinformation, a measurement gap requirement, and a physical layerparameter.
 8. The method of claim 7, wherein the UE capabilityinformation message includes both the first field and the second fieldif the first capability information is different from the secondcapability information.
 9. The method of claim 7, wherein the UEcapability information message includes either the first field or thesecond field if the first capability information and the secondcapability information have the same value.
 10. An evolved Node B (eNB)comprising: a transceiver configured to: transmit a message requestingcapability information, and receive a user equipment (UE) capabilityinformation message including at least one of a first field for firstcapability information and a second field for second capabilityinformation in response to the request message, wherein the firstcapability information is applicable to either a frequency divisionduplex (FDD) mode or a time division duplex (TDD) mode and the secondcapability information being applicable to both the FDD mode and the TDDmode, and wherein, the first capability and the second capabilityinformation comprise at least one of a feature group indicator (FGI), UEspecific reference signal information, a measurement gap requirement,and a physical layer parameter.
 11. The eNB of claim 10, wherein the UEcapability information message includes both the first field and thesecond field if the first capability information is different from thesecond capability information.
 12. The eNB of claim 10, wherein the UEcapability information message includes either the first field or thesecond field if the first capability information and the secondcapability information have the same value.